Features and Benefits

  • Easy peel & stick application – no fastener punctures
  • Poly facer provides excellent foot traction and adhesion to cap sheet
  • Designed for use with Westlake Royal TileSeal™ HT, Westlake Royal™ MetalSeal HT and GatorSeal®
  • Install in high winds
  • No special tools or hot asphalt needed
  • Excellent moisture resistance and thermal stability
  • SBS modified asphalt core self-seals nail penetrations


Installation Guide


Miami Dade Approval


Order Sample*
*Due to increased sample order volumes, delivery times may be a bit longer than normal.

Self-Adhering Base Sheet

Citadel® Plus SBS modified asphalt core self-seals around nail or screw penetrations when mechanically fixing roofing. Seals to the roof deck providing additional security against potential leaks compared to mechanically fastened base sheets.

Peel & Stick application requires no special tools, no hot asphalt for hot mopping.

The poly faced surface designed to provide foot traction and maximum adhesion of Westlake Royal Roofing Components cap sheets:

  • Westlake Royal TileSeal™ HT – Westlake Royal Roofing Components’ strongest, most durable underlayment for tile, metal, shingle, shake or slate roofing
  • GatorSeal®- granular surfaced SBS modified asphalt underlayment with heavy-duty fiberglass reinforcement for strength and durability


Citadel® Plus has a manufacturer’s limited warranty when used with Westlake Royal Roofing Components’ cap sheet underlayments:

  • 30 year warranty when installed as a base sheet under Westlake Royal TileSeal™ HT
  • 20 year warranty when installed as a base sheet under GatorSeal®